CN112548034A - Casting sand mold, process and sand mold water content control system - Google Patents
Casting sand mold, process and sand mold water content control system Download PDFInfo
- Publication number
- CN112548034A CN112548034A CN202110018560.XA CN202110018560A CN112548034A CN 112548034 A CN112548034 A CN 112548034A CN 202110018560 A CN202110018560 A CN 202110018560A CN 112548034 A CN112548034 A CN 112548034A
- Authority
- CN
- China
- Prior art keywords
- sand mold
- casting
- water content
- sand
- control system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
Abstract
A casting sand mold, a process and a sand mold water content control system belong to the technical field of casting processes. In the casting process, in order to ensure that the molding sand has certain adhesiveness before the molten iron is cast, the molding sand must contain certain moisture, and the trace moisture is violently gasified when contacting with high-temperature molten metal, so that the surface of a casting has large roughness, and the casting can be bonded with the sand in serious cases, so that the casting fails. The invention provides a sand mold with variable water content, a casting process and a control method of the water content of the sand mold, which are equivalent to the exhaust of special parts of the sand mold in advance, thereby omitting the step of manufacturing exhaust holes, avoiding the evaporation of water vapor in the casting process and improving the surface quality of castings.
Description
Technical Field
A casting sand mold, a process and a sand mold water content control system belong to the technical field of casting processes.
Background
In the casting process, in order to ensure that the molding sand has certain adhesiveness before the molten iron is cast, the molding sand must contain 2-4% of moisture, and the trace moisture is violently gasified when contacting with high-temperature molten metal, so that the surface of a casting has larger roughness, and the casting can be bonded with the sand seriously, thereby causing casting failure. At present, the mode of reasonably arranging the vent holes in the sand mold is adopted, so that sand sticking of the casting is avoided, the casting quality is improved, but the vent holes and the air passages arranged in the sand mold can only discharge part of produced gas at the upper part of the cavity, when the surface of the casting sand is covered by molten metal, the subsequent produced gas is difficult to discharge, and at the moment, the produced gas on the surface of the casting, especially on the lower surface of the cavity, can continuously impact and deteriorate the surface condition of the casting. With the urgent need of further energy saving and cost reduction in the production process, the mode of increasing air holes and optimizing the arrangement of the air holes meets the bottleneck if the quality of castings is further improved.
At present, a casting process which can reduce the water vapor on the surface of molding sand in the casting process and does not influence the surface quality of a casting does not exist.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the casting sand mold, the process and the sand mold water content control system which can reduce the influence of water on the surface of a casting during casting and can ensure the quality of the sand mold are provided.
The technical scheme adopted by the invention for solving the technical problems is as follows: a casting sand mold is characterized in that: the water content of the position where the sand mold is not smooth in exhaust and has enough strength is 30-90% lower than that of the surrounding position; (ii) a The positions with poor air exhaust and sufficient strength comprise: the acute angle part of the sand mold is convex or concave compared with the sand mold surface of the periphery sand mold.
The water content of special or special-shaped parts of the sand mold is controlled in advance, the sand mold with variable water content is manufactured, steam cannot be generated at the position where partial exhaust is not smooth when metal liquid is contacted, the influence of gas on the surface of a casting is avoided from the source, vent holes can be greatly reduced or even not used, the process of manufacturing the sand mold can be simplified, and the influence of the shape, strength and the like of the sand mold, which is caused by overcoming the steam problem, is avoided only by reducing the water content of the parts of the positions. The position that sand mould intensity is high of itself exhausts more smoothly, consequently the moisture content transfers lowly, and to the position that intensity is lower, it can be completely through loose molding sand exhaust in the casting process, consequently also need not too low moisture content.
Preferably, the water content of the obtuse angle or fillet part in the sand mould surface which is convex or concave compared with the peripheral sand mould surface is 70-90% lower than that of the peripheral position.
Preferably, the water content of the obtuse angle or the round angle part is 85-87% lower than that of the surrounding position.
Preferably, the water content of the acute angle part of the sand mold is 50-70% lower than that of the surrounding position.
Preferably, the moisture content is reduced by evaporating water by local heating at a position where the air exhaustion is not smooth and the strength is sufficient. The process of heating and evaporation is relatively mild, and the molding sand with different water contents does not need to be prepared in advance.
A casting process, characterized by: and adjusting the water content of the position with unsmooth exhaust and enough strength of the sand mould after the sand mould is manufactured, and then casting. The water content can be controlled according to the special parts after the sand mold manufacturing process is directly finished, which is equivalent to once exhausting the sand mold in advance, the exhaust effect is better, the difficulty of the sand mold manufacturing process can not be improved, and the flatness and the strength of the surface of a casting can be effectively improved.
Preferably, the method of adjusting the water content is irradiating the sand mold with heat radiation. In the casting process, the positions with unsmooth exhaust and enough strength are irradiated for different time by using heat radiation during sand mold manufacturing, the longer the irradiation time is, the lower the water content is, the less water vapor is generated during metal liquid casting, and the smoother the surface of the casting is. The irradiation heating mode does not need to contact the surface of the sand mold, does not directly apply force to the sand mold, does not influence the quality of the sand mold, is closer to the surface state of the sand mold when molten metal is added, and is easy to control the heating temperature and the process.
Preferably, the thermal radiation is incandescent radiation. The heating efficiency of the incandescent lamp irradiation is high.
A sand mould moisture content control system for above-mentioned casting process which characterized in that: comprises a three-dimensional guide rail and a heat radiation source; the heat radiation source is connected with the three-dimensional guide rail. The power supply of the thermal radiation source can also be connected with the thermal radiation source after being connected with the three-dimensional guide rail, so that the connecting wire is prevented from influencing operation or touching the sand mold in the operation process. The three-dimensional guide rail is arranged around the sand mould, so that the irradiation position of the thermal radiation source can be conveniently adjusted, the corner positions of various special-shaped sand moulds are irradiated to reduce the water content, and the casting of special-shaped castings is realized.
Preferably, the thermal radiation source is connected to the three-dimensional guide rail by a universal pipe. The universal tube can freely adjust the radiation direction of the thermal radiation source, even can adjust the radiation direction to be the direction of the three-dimensional guide rail, and makes up the angle and the position which are reached by the thermal radiation source guided by the three-dimensional guide rail.
Preferably, the thermal radiation source is a tungsten halogen lamp. The halogen tungsten lamp has higher preheating efficiency and heating power, the heating temperature is controllable, the temperature rise is mild, the influence on the sand mold is less, and the influence on the strength of the sand mold due to too low water content caused by overheating is avoided.
Compared with the prior art, the invention has the beneficial effects that: the sand mold with variable water content is used for casting in a targeted manner, the position with unsmooth air exhaust is exhausted in advance, and meanwhile, the bonding capability in the sand mold manufacturing process is not influenced; and a system adaptive to the sand mold and the process is provided, so that the water content of the molding sand at various angles can be controlled in the sand mold manufacturing process, the sand mold manufacturing of various special castings is realized, and the flatness of the surface of the casting and the strength of the casting are improved.
Drawings
Fig. 1 is a schematic diagram of a sand mold water content control system in example 1.
Wherein: 1 three-dimensional guide rail x axle, 2 three-dimensional guide rail z axles, 3 three-dimensional guide rail y axles, 4 hot lamp connecting rods, 5 hot lamps, 6 sand moulds, 7 lower moisture content regions, 8 extremely low moisture content regions, 9 low moisture content regions.
Detailed Description
Example 3 is the best embodiment of the present invention, and the present invention will be further explained with reference to fig. 1 and examples.
The moisture content in the following examples is detected by using a foundry sand online moisture measuring instrument MS-590, and the detection precision of the instrument is +/-0.1% and the error is +/-0.2%. The water content of the sand mold used in the following examples is 4.5-5% of that of the standard sand mold.
Example 1
Referring to figure 1: a casting sand mold, the sand mold 6 has lower water content than the peripheral sand mold 6 compared with the convex or concave sand mold surface of the peripheral sand mold 6 and the acute angle part of the sand mold 6, wherein the flat or smooth convex or concave sand mold 6 adopts lower water content, in the embodiment, the average value of the water content of the lower water content area 7 is 2.5-3% and is 50% -60% lower than the peripheral sand mold 6 (5% water content); for the obtuse-angle-shaped groove, a sand mold 6 with extremely low water content is adopted, in the embodiment, the water content of the extremely low water content area 8 is 0.7 percent and is 86 percent lower than that of the surrounding sand mold 6 (with the water content of 5 percent); for the acute-angle or sharp-shaped protrusion, the sand mold 6 with low water content is adopted, and in the embodiment, the average water content of the low water content area 9 is 1.5-2% and is 60-70% lower than that of the surrounding sand mold 6 (5% water content).
In order to realize the casting sand mold, after the sand mold is manufactured, a halogen tungsten lamp is used for respectively irradiating a lower water content area 7, an extremely low water content area 8 and a low water content area 9, and after the halogen tungsten lamp is preheated for 1min, the irradiation time of the lower water content area 7 is 7-13 s; the irradiation time of the extremely low water content area 8 is 40 s; the irradiation time to the low water content region 9 is 20-25 s. And casting molten iron after the irradiation is finished, and finishing casting.
A sand mold water content control system comprises a three-dimensional guide rail and a heat radiation source, wherein the three-dimensional guide rail comprises a three-dimensional guide rail x axis 1, a three-dimensional guide rail z axis 2 and a three-dimensional guide rail y axis 3, the heat radiation source adopts a heat illuminator 5, and the heat illuminator 5 is a halogen tungsten lamp; the halogen tungsten lamp is connected to the three-dimensional guide rail through the hot lamp connecting rod 4 and can move along the three-dimensional guide rail, the x axis 1 and the y axis 3 of the three-dimensional guide rail are horizontal axes, and the z axis 2 of the three-dimensional guide rail is an axis vertical to the bottom surface; the three-dimensional guide rail is arranged right above the sand mould 6. And adjusting the position of the halogen tungsten lamp by using the sand mold water content control system to enable the halogen tungsten lamp to irradiate different parts of the sand mold 6 so as to control the water content of different parts of the sand mold 6, thereby realizing the casting process.
Example 2
On the basis of the casting sand mold, the casting process and the water content control system in the embodiment 1, the water content control system of the sand mold replaces the hot lamp connecting rod 4 with a universal tube, and the halogen tungsten lamp is arranged inside the end part of the universal tube.
In the casting sand mold and the casting process, the irradiation time of the extremely low water content region 8 is set to 45s, and the water content is detected to be 0.5. Setting the irradiation time of the lower water content of 7 as 10-16 s, and detecting that the water content is 2-2.7%.
Example 3
On the basis of the casting sand mold, the casting process and the water content control system in the embodiment 2, 3 halogen tungsten lamps are connected to the three-dimensional guide rail of the sand mold water content control system.
In the casting process, three parts of the sand mold 6 are subjected to heat radiation simultaneously, so that the water content control efficiency is improved.
In a casting sand mold, after irradiation, through moisture content detection, the average value of the moisture content of the lower moisture content area 7 is 2-2.3%; the average water content of the low water content area 9 is 1.5-1.7%. Therefore, it was confirmed that the water content in different portions can be controlled more accurately by shortening the total irradiation time of the sand mold 6.
Comparative example 1
A casting technology includes such steps as making the sand mould, punching the exhaust holes, and casting molten iron.
Performance testing
For the castings cast in the examples 1 to 3 and the comparative example 1, the area of the sand mold 6 is 1 square centimeter, the number of holes or pits on the casting is counted under a microscope, and the average value is calculated after counting all sampling points of the same example or comparative example. The results of the performance testing are shown in table 1 below.
TABLE 1 number of defects per unit area of casting surface
According to table 1, the casting sand mold prepared by the sand mold water content control system and the casting process can maintain the shape of the sand mold and effectively reduce moisture generated on the surface of the casting during casting, so that small holes or pits on the surface of the casting are reduced, the surface of the casting sand mold is smoother and smoother compared with a casting prepared by exhausting in a traditional exhaust hole mode, particularly according to the performance test result of embodiment 3, the water content of the casting sand mold can be more accurately controlled by simultaneously controlling the water content of the casting sand mold through a plurality of halogen tungsten lamps, and according to the comparison between embodiment 2 and embodiment 1, the flatness of the surface of the casting can be effectively improved due to the lower water content caused by longer-time heat radiation, and compared with the traditional exhaust hole mode of comparative example 1, embodiments 1 to 3 have a remarkable lifting effect on the surface of the casting.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. A casting sand mold is characterized in that: the water content of the position on the casting sand mould where the exhaust is not smooth and the strength is enough is 30-90% lower than that of the surrounding position; the positions with poor air exhaust and sufficient strength comprise: the acute angle part of the sand mold is convex or concave compared with the sand mold surface of the periphery sand mold.
2. A casting sand mold according to claim 1, characterized in that: and in the sand mould surface which is convex or concave compared with the peripheral sand mould surface, the water content of the obtuse angle or fillet part is 70-90% lower than that of the peripheral position.
3. A casting sand mold according to claim 2, characterized in that: the water content of the obtuse angle or the round angle part is 85-87% lower than that of the surrounding position.
4. A casting sand mold according to claim 1, characterized in that: the water content of the acute angle part of the sand mold is 50-70% lower than that of the surrounding position.
5. A casting sand mold according to claim 1, characterized in that: and the water content is reduced by evaporating water through local heating at the position where the air exhaust is not smooth and the strength is enough.
6. A casting process using the casting sand mold according to any one of claims 1 to 5, characterized in that: and adjusting the water content of the position with unsmooth exhaust and enough strength of the sand mould after the sand mould is manufactured, and then casting.
7. The casting process according to claim 6, wherein: the method for adjusting the water content is to irradiate the sand mold by using heat radiation.
8. A sand mold water content control system for the casting process according to any one of claims 6 to 7, characterized in that: comprises a three-dimensional guide rail and a heat radiation source; the heat radiation source is connected with the three-dimensional guide rail.
9. The sand mold moisture content control system according to claim 8, characterized in that: the heat radiation source is connected with the three-dimensional guide rail through the universal pipe.
10. The sand mold moisture content control system according to claim 8, characterized in that: the heat radiation source is a halogen tungsten lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110018560.XA CN112548034A (en) | 2021-01-07 | 2021-01-07 | Casting sand mold, process and sand mold water content control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110018560.XA CN112548034A (en) | 2021-01-07 | 2021-01-07 | Casting sand mold, process and sand mold water content control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112548034A true CN112548034A (en) | 2021-03-26 |
Family
ID=75035338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110018560.XA Pending CN112548034A (en) | 2021-01-07 | 2021-01-07 | Casting sand mold, process and sand mold water content control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112548034A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309491A (en) * | 2021-12-29 | 2022-04-12 | 大连船用推进器有限公司 | Cavity structure and method convenient for observing drying state of large propeller blade |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB261113A (en) * | 1925-08-18 | 1926-11-18 | Sand Spun Patents Corp | Method of centrifugally casting hollow metal bodies, and hollow bodies cast by such method |
| CN2233297Y (en) * | 1995-06-12 | 1996-08-21 | 机械工业部第六设计研究院 | Movable mould face drying device |
| CN1227777A (en) * | 1998-01-16 | 1999-09-08 | 洛兰曼迪股份有限公司 | Process for obtaining non-ferrous metal castings by greensand mould casting |
| CN106475517A (en) * | 2015-08-27 | 2017-03-08 | 武汉重型机床集团有限公司 | Prevent heavy castings choke fire method of operating |
| CN106573293A (en) * | 2014-08-29 | 2017-04-19 | 日立金属株式会社 | Green sand mold for casting and method for manufacturing cast articles using same |
| WO2018097179A1 (en) * | 2016-11-22 | 2018-05-31 | 旭有機材株式会社 | Coated sand, manufacturing method for same, and manufacturing method for mold using same |
| CN209736568U (en) * | 2019-03-25 | 2019-12-06 | 河南旭锐合金新材料制造有限公司 | Heating device for resin sand production line |
-
2021
- 2021-01-07 CN CN202110018560.XA patent/CN112548034A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB261113A (en) * | 1925-08-18 | 1926-11-18 | Sand Spun Patents Corp | Method of centrifugally casting hollow metal bodies, and hollow bodies cast by such method |
| CN2233297Y (en) * | 1995-06-12 | 1996-08-21 | 机械工业部第六设计研究院 | Movable mould face drying device |
| CN1227777A (en) * | 1998-01-16 | 1999-09-08 | 洛兰曼迪股份有限公司 | Process for obtaining non-ferrous metal castings by greensand mould casting |
| CN106573293A (en) * | 2014-08-29 | 2017-04-19 | 日立金属株式会社 | Green sand mold for casting and method for manufacturing cast articles using same |
| CN106475517A (en) * | 2015-08-27 | 2017-03-08 | 武汉重型机床集团有限公司 | Prevent heavy castings choke fire method of operating |
| WO2018097179A1 (en) * | 2016-11-22 | 2018-05-31 | 旭有機材株式会社 | Coated sand, manufacturing method for same, and manufacturing method for mold using same |
| CN209736568U (en) * | 2019-03-25 | 2019-12-06 | 河南旭锐合金新材料制造有限公司 | Heating device for resin sand production line |
Non-Patent Citations (2)
| Title |
|---|
| 吴弘等: "湿型砂铸件鼠尾形成机理分析", 《铸造》 * |
| 方世良等: "薄壁灰铁件针状气孔的成因分析及防止措施", 《现代铸铁》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309491A (en) * | 2021-12-29 | 2022-04-12 | 大连船用推进器有限公司 | Cavity structure and method convenient for observing drying state of large propeller blade |
| CN114309491B (en) * | 2021-12-29 | 2023-11-14 | 大连船用推进器有限公司 | Cavity structure and method convenient for observing baking state of large-sized propeller blade |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112548034A (en) | Casting sand mold, process and sand mold water content control system | |
| CN104707931A (en) | Manufacturing method for large high-temperature alloy disk-type die forging parts | |
| CN102392114B (en) | Thermal calibration method for precisely cast structural pieces of cartridge receiver | |
| CN210188159U (en) | Pressure tank forming die | |
| CN105750468B (en) | A kind of liquid nitrogen cooling device and method of automobile front axle forge rolling die tool | |
| CN113134669A (en) | Heating device in plasma welding box | |
| CN108611473A (en) | End hardening testing machine | |
| CN103710491A (en) | Air quantity adjusting apparatus for ageing furnace | |
| CN109093087B (en) | Casting blank corner heating method | |
| CN208035485U (en) | A kind of light source controller electronic component microwave hot-press stove mold | |
| CN207770604U (en) | A kind of ceiling covering bent into shape tooling | |
| CN1544185A (en) | Pipe burying copper cooling piece manufacturing method | |
| CN202162227U (en) | Seamless forked pipe forming mould | |
| CN207276662U (en) | A kind of thin part annealing device | |
| CN107999628A (en) | A kind of ceiling covering bent into shape frock | |
| CN102248242B (en) | Aluminum alloy vacuum welding method capable of eliminating silicon segregation | |
| CN202380044U (en) | Heat treatment furnace for normalizing and annealing cylinder cast under protection of nitrogen | |
| CN210131969U (en) | Single-point incremental forming hot air heating workbench | |
| CN207458751U (en) | A kind of stereo amorphous alloy wound iron core molding machine | |
| CN114309647B (en) | Control method for controlling deformation of 3D printing thin and high piece | |
| CN111185553A (en) | Electric upsetting forming method for dynamically regulating grain refinement under assistance of side mold | |
| CN212216718U (en) | Novel poor strong board shaping device | |
| CN207326130U (en) | A kind of TR components ballast pedestal | |
| CN216177390U (en) | Energy-saving reflow soldering equipment | |
| CN205011793U (en) | Novel laser surface hardening equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210326 |
|
| RJ01 | Rejection of invention patent application after publication |